There is so much variation in habitat of Western Brown Elfin, host-plant association, and ventral color and pattern that this may actually be more than one biological species; it is by no means clear that it (or some components of "it") is actually conspecific with the eastern I. augustinus. Host plants include Dodder (Cuscuta), Soap Plant or Amole (Chlorogalum, Liliaceae!), and flower buds or young fruit of Ceanothus and Arctostaphylos species - a bizarre mix indeed, though there is nothing to suggest any local population uses more than one of them. Late January or February to July, depending on locality.
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